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Photosynthesis and respiration in five species of benthic Foraminifera that host algal endosymbionts

Robert A. Walker, Pamela Hallock, Joseph J. Torres and Gabriel A. Vargo
Photosynthesis and respiration in five species of benthic Foraminifera that host algal endosymbionts
Journal of Foraminiferal Research (October 2011) 41 (4): 314-325


Oxygen production and consumption were measured in five species of benthic foraminifers using a "Clark-type" oxygen electrode. Net photosynthesis and respiration were calculated and normalized to mu g chlorophyll a for the chlorophyte-bearing soritid foraminifers Archaias (Ar.) angulatus and Cyclorbiculina compressa, and the diatom-bearing amphisteginids Amphistegina gibbosa, Am. lessonii, and Am. radiata. Chlorophyll a concentrations were 40-50% lower in C. compressa than in the four other species. Photosynthesis/Irradiance (P/E) curves were generated by fitting data to the hyperbolic tangent equation, P = P (sub max) tanh (alpha E/P (sub max) ), yielding the derived photosynthetic parameters, P (sub max) , alpha , and E (sub k) . Calculated maximum oxygen production (P (sub max) ), when normalized to chl a, was 3-4X higher in the soritids than in the amphisteginids. Photosynthetic efficiency (alpha ) was approximately two-fold higher in Am. gibbosa and approximately 50% higher in Am. lessonii than in the soritids. Calculated P/E data for Am. radiata were too variable to estimate an alpha . Median E (sub k) , which indicates approaching light saturation, was 13 mu mol photon m (super -2) s (super -1) for Am. gibbosa and Am. radiata, 26 mu mol photon m (super -2) sec (super -1) for Am. lessonii, and 86 and 122 mu mol photon m (super -2) sec (super -1) respectively for Ar. angulatus and C. compressa. These values are consistent with the habitats occupied by these foraminifers and with results of previous studies that used other methods. Median factorial metabolic scope, which is the ratio of respiration rate under normal activity to resting metabolic rate, was 2-4 for the amphisteginids versus 9-10 for the soritids. Archaias angulatus, C. compressa and Am. lessonii appear to be net primary producers, whereas Am. gibbosa and Am. radiata are net consumers.

ISSN: 0096-1191
EISSN: 1943-264X
Serial Title: Journal of Foraminiferal Research
Serial Volume: 41
Serial Issue: 4
Title: Photosynthesis and respiration in five species of benthic Foraminifera that host algal endosymbionts
Affiliation: University of South Florida, College of Marine Science, Saint Petersburg, FL, United States
Pages: 314-325
Published: 201110
Text Language: English
Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States
References: 59
Accession Number: 2011-103558
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF Grant OCE-92-3278 and CHE-0221834
Illustration Description: illus. incl. 3 tables
N24°30'00" - N25°19'60", W81°49'60" - W80°15'00"
S04°04'60" - S04°04'60", E153°39'00" - E153°39'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201152
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